Damper-regulator



L. W. MILLIS.

DAMPER REGULATOR.

APPLICATION FILED MAR. to. 1921.

Patented May 31, 1921.

LEE-

1117272 iV/MiZlz's- 749192665:

gwoentoz iii LINN w. inus; OF KANSAS CITY, MISSOURI.

nAMPER-RiieUnAroR.

Application filed March 16, 1921. Serial No. 451,262. r

and useful Improvements in Damper-Regulators, of which the following is a specification.

My invention relates to lmprovements 1n damper regulators for furnacesand other heaters which are generally located in the basement and provided with a smoke damper and a cold air check valve, and the essential purpose of the invention is to connect said cold air check valve and the smoke damper with a lost motion sufficient to allow the smoke damper to be almost entirely closed without affecting the position of the check valve, but when moved beyond the limit of its; lost motion, operates to open the check valve for the admission of cold air to the draft-pipe. i

Another feature of'the invention is the provision of a flexible connection for controlling the smoke damper from an upper floor. i

In order that the invention may be fully understood, reference will now be had to the accompanying drawing, in which:

Figure 1 is a side elevation of the invention applied to the draft pipe of afurnace.

Fig. 2is an'enlarged plan view.

Fig. 3 is an irregular longitudinal section on line IIIIH of Fig. 2.

Fig. 4 is an end elevation,

A designates a furnace which is provided with a draft pipe 2 having a housing 4 at its upper portion.

6 designates the smoke damper arranged in the draft pipe 2 and fixed to a spindle 8 journaled at its lower end in the draft pipe 2 and at its upper portion in the housing 4. The upper portion of the spindle 8 is formed into a crank arm 10 having a loop 12 intermediate its ends and an eye 14 at its outer end.

16 designates the cold air check valve which is mounted upon a spindle 18 journale'd in opposite sides of the housing 4 to normally close an air inlet 17 in the upper portion of said housing 4. The check valve 16 is self-closing, it being weighted at one side as indicated at 19, for that purpose. A flange 20 on the housing 4 serves as a stop for the check valve 16 when the same moves to cl sed p t n 22 designates a link connected atone end to an arm 24 projecting from the check valve 16 and having a sliding connection at its opposite end with an eye 25 on the crank arm 10, to allow the smoke damper 6 to have limited independent movement ofthe check Valve 16. The extent of such limited independent movement is determined by stops 26 and 28, spaced apart upon the link 22.

30 designates a flexible connection whereby the smoke damper 6 may be closed or partly closed from an upper floor. Said Specification of Letters Patent. 6 lligty 31, 1921.

cable 30 extends around aguide sheave 32" i and is secured at itslower end to the eye 14' of'the' crank arm 10;

34 designates a flexibl'efconnection connected to the loop 12 and provided with a weight to open the smoke damper 6 when the cable 30 is lowered'. As shown on the drawing the flexible connection 34 extends over a guide sheave 86.

t In practice the smokedamper 6 maybe closed or partially closed by pulling up wardly on the flexible connection 30. Owing 'to the lost motion between the crank arm 10 and the link 22 the latter will not be actuated to open the check valve 16 until the eye 25v of the crank arm 10 impinges against the stop 28hand moves the link 22:forwardly l/Vhen desired the smoke damper 6 is re-. stored to open. position by lowering the flexible connection 30 which.permits the crank arm 10 to be drawn backwardly by the flexible connection 84-and the weight 35,- to the position disclosed by Figs. 2 and 3.

As the crank arm 10 moves backwardly the 6 in fuel is effected as under ordinary circum-- stances the fire in the furnace can be controlled withthe smoke damper 6 and without cooling off the draft pipe 2 by admitting cold air through the inlet 17. This is an important feature, because when the temperature of the draft pipe 2 is lowered by the admission of cold air through the inlet 17 it requires a considerable. consumption of l to ga n he s id draf P p 3 a i sufficient degree toobtain an efficient draft, whereas if the draft is largely controlled by the smoke damper 6 the temperature of the draft pipe 2 is not lowered by the admission of cold air, and hence only a relatively small amount of fuel is consumed in restor ing the draft to the desired temperature.

l/Vhile I have shown the invention applied to a horizontal section of draft pipe it will operate equally as Well on an inclined, or vertical section, as the guide sheaves 82 and '36 are mounted in holders 40 and 42, respectively, which are loosely connected to the housing 4 to accommodate themselves to the different angles at which the cables may be arranged. Other changes may be made in the construction, arrangement and combination of parts, falling within the spirit and scope of the claims.

Having thus described'my invention, what I claim and desire to secure by Letters Patent, is: p

1. In a device of the character described, a draft-pipe having an opening for the admission of cold air, a smoke damper operably ntiounted in said draft-pipe, a checkvalve to control the admission of cold air to'the draft-pipe through the opening, and a connection between the smoke damper and said check valve having lost motion, whereby the former may be closed, or practically closed, before the latter is opened.

2. In a device of the: character described, a draft-pipe having an opening for the admission of cold air, a smoke damper operably mounted in said draft-pipe, a checkvalve to control the admission of cold air to the draft-pipe through the opening, a connection between the smoke damper and said check valve having lost motion, whereby the former may be closed, or practically closed, before the latter is opened, and means for closing the check-valve as the smoke damper moves toward open position.

3. In a device of the character described, a draft-pipe having an opening for the admission of cold, air, a smoke damper operably mounted in said draft-pipe, a checkvalve to control the admission of cold air to the, draft-pipe through the opening, a connection between the smoke damper and said check valve having lost motion, where by the former maybe closed, or practically closed, before the latter is opened, and a weight on the check valve to close the same as the smoke damper moves toward open position.

4'. In a device of the character described, a draft-pipe having an opening for the admission of cold air, a smoke damper operably mounted in said draft-pipe, a checkvalve to control the admission. of cold air to the draft-pipe through the opening, arms for actuating the smoke damper and the check valve, and an element connected to one of said arms and having a lost motion connection with the other arm" so. that the smoke damper may close, or partially close before the check-valve is opened.

5. In a device of the character described, a draft-pipe having an opening for the admission of cold air, a smoke damper operably mounted in said draftpi 3e, a self-clos check-valve to control the admission of cold air to the draft-pipe throughthe open ing, arms for actuating the smoke damper and the check valve, an element connected to one of said arms and having alost motion connection with the other arm so that the smoke damper may close, or partially close before the check-valve is opened, spaced stops at opposite sides of one arm and fixed to said element to limit its lost motion, manual means for moving the smoke damper arm in one direction, and automatic means to move said smoke damper arm in an opposite direction.

In testimony whereof I afiix my signature in the presence of two witnesses.

LINN W. MlLLlS. Witnesses L. J. Fisorrnn, F. C. FIsoHER, 

